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//! Lazy loading methods for App.
use crate::error::XorcistError;
use crate::jj::fetch_graph_log_after;
use super::{App, DEFAULT_BATCH_SIZE, LOAD_MORE_THRESHOLD};
impl App {
/// Set the log entry limit and determine if more entries might be available.
pub fn set_log_limit(&mut self, limit: Option<usize>) {
self.log_limit = limit;
// If no limit (--all), we have all entries
// Otherwise, assume more entries exist if we loaded exactly the limit
self.has_more_entries = match limit {
None => false,
Some(n) => self.graph_log.commit_count() >= n,
};
}
/// Request a check for loading more entries.
/// This sets a flag that will be checked by the event loop.
pub fn request_load_more_check(&mut self) {
self.pending_load_more = true;
}
/// Check if we should load more entries.
/// Returns true if load is needed and conditions are met.
pub fn should_load_more(&self) -> bool {
if !self.pending_load_more {
return false;
}
// Skip if:
// - No limit set (--all mode, already have everything)
// - No more entries available
// - Already loading
// - Not near the end of the list
if self.log_limit.is_none() || !self.has_more_entries || self.is_loading_more {
return false;
}
let entries_from_end = self.commit_count().saturating_sub(self.selected);
entries_from_end <= LOAD_MORE_THRESHOLD
}
/// Mark that we're starting to load more entries.
pub fn start_loading(&mut self) {
self.is_loading_more = true;
self.pending_load_more = false;
}
/// Actually load more entries.
/// Should be called after start_loading() and a redraw.
pub fn load_more_entries(&mut self) -> Result<bool, XorcistError> {
// Get the last commit's change_id to use as anchor
let last_selection = self.commit_count().saturating_sub(1);
let Some(after_change_id) = self.graph_log.change_id_for_selection(last_selection) else {
self.is_loading_more = false;
return Ok(false);
};
let after_change_id = after_change_id.to_string();
// Fetch more entries
let batch_size = self.log_limit.unwrap_or(DEFAULT_BATCH_SIZE);
let additional = fetch_graph_log_after(&self.runner, &after_change_id, batch_size)?;
self.is_loading_more = false;
if additional.is_empty() || additional.commit_count() == 0 {
self.has_more_entries = false;
return Ok(false);
}
// If we got fewer than requested, we've reached the end
if additional.commit_count() < batch_size {
self.has_more_entries = false;
}
// Merge additional lines into existing graph_log
self.graph_log.extend(additional);
Ok(true)
}
}